CN101158793B

CN101158793B - LCD panel

Info

Publication number: CN101158793B
Application number: CN2007101870242A
Authority: CN
Inventors: 杨敦钧; 李锡烈
Original assignee: AU Optronics Corp
Current assignee: AUO Corp
Priority date: 2007-11-19
Filing date: 2007-11-19
Publication date: 2010-12-01
Anticipated expiration: 2027-11-19
Also published as: CN101158793A

Abstract

The invention discloses a liquid crystal display panel, which comprises a first substrate, a second substrate parallel to the first substrate and a liquid crystal layer positioned between the first substrate and the second substrate. The first substrate has a plurality of sub-pixel regions, and the first substrate includes a first substrate, a switching element array, a dielectric layer, and a reflective electrode. The switching element array is disposed on the first substrate, wherein the switching element array includes a first switching element disposed in the sub-pixel region. The dielectric layer is located on the switch element array and has at least one contact hole. The dielectric layer has a concave-convex structure, the convex part of the concave-convex structure has a height t and a width d, and the side wall of the convex part has an inclination angle theta, wherein the width d is not less than 2 × t × cot theta. The reflecting electrode is arranged on the dielectric layer and is electrically connected with the first switch element through the contact hole.

Description

Display panels

Technical field

The present invention relates to a kind of display panels, more particularly, relate to a kind of display panels that promotes reflection efficiency.

Background technology

Because LCD has that external form is light and handy, power consumption is low and advantage such as radiationless pollution, thereby is applied to widely in the various electric consumers, for example mobile computer, personal digital assistant, mobile phone etc., and widely the user likes.In recent years, LCD even replaced the cathode-ray tube display of traditional desktop PC.According to the light source mechanism of LCD, can divide into penetration, reflective and Transflective three classes again.Wherein, penetrating LCD is to provide light source by backlight module, and its power consumption is big and can make display effect not good when surround lighting is too strong.Reflective liquid-crystal display then is to replace transparent electrode layer with reflection electrode layer, come as light source by extraneous light, thereby do not need to use backlight module, but its brightness is more inhomogeneous and just can't use when ambient light is not enough.Therefore, transflective liquid crystal display just becomes a kind of direction of development.

At first, have first substrate, 102, the second substrates 106 at known half-penetration half-reflection liquid crystal display panel 100 and be parallel to first substrate 102, and liquid crystal layer 104 is between first substrate 102 and second substrate 106 with reference to Fig. 1.Each sub picture element zone in the display panels 100 has an echo area 101 and a penetrating region 103.Display panels 100 has backlight and environment light source is used for showing.Backlight provides light T1 by penetrating region 103, and environment light source then provides light R1 and R2 respectively at penetrating region 103 and echo area 101 reflections.Since reflection ray R1 than R2 a little less than, reflection ray R1 can be ignored hereinafter.Reflection ray R2 solves surround lighting not good problem of display effect when too strong by reflecting electrode 105.Yet as shown in Figure 1 as can be known, reflecting electrode 105 reflection efficiencies have its restriction, cause light R2 reflection efficiency to limit to some extent and display effect is effectively promoted, and the reflection direction of light R2 is not the best angle that the user watched sometimes.

The LCD advantage of micro-reflection type do not need to be extra adding technology, can make little reflecting element in general penetration display panel, to solve it causes poor display excessively by force at surround lighting shortcoming.Yet the reflection efficiency of traditional micro-reflection type panel has its restriction and can't effectively promote, therefore be necessary to provide a kind of easy enforcement and cheaply mode promote the reflection efficiency of display panels.

Summary of the invention

The object of the present invention is to provide a kind of easy enforcement and cheaply mode promote the reflection efficiency of display panels.

The invention provides a kind of display panels, comprise first substrate, second substrate, reach liquid crystal layer.First substrate has a plurality of sub picture elements district, and first substrate comprises first substrate, switch element array, dielectric layer, reaches reflecting electrode.Switch element array is arranged in first substrate, and wherein switch element array comprises first on-off element, and it is arranged in picture element region one time.Dielectric layer is positioned on the switch element array, and has at least one contact hole.Dielectric layer has a concaveconvex structure, and the protuberance of this concaveconvex structure has a height t and a width d, and the sidewall of protuberance has a tiltangle, and wherein width d is not less than 2*t*cot θ.Reflecting electrode is arranged on the dielectric layer and by contact hole and described first on-off element and electrically connects.Second substrate is parallel to first substrate, and liquid crystal layer is between first substrate and second substrate.

The present invention provides a kind of display panels on the other hand, comprises first substrate, second substrate, reaches liquid crystal layer.First substrate has a plurality of sub picture elements district, and first substrate comprises first substrate, switch element array, capacitor lower electrode, dielectric layer, reaches reflecting electrode.Switch element array is positioned in first substrate, and wherein switch element array comprises that one first on-off element is arranged in picture element region one time, and this first on-off element has an insulation course.Capacitor lower electrode is positioned in first substrate.Dielectric layer is positioned on switch element array and the capacitor lower electrode, and directly contacts with this capacitor lower electrode, and dielectric layer has a plurality of concaveconvex structures separated from one another and is positioned on this insulation course.Reflecting electrode is arranged on the dielectric layer and electrically connects by the contact hole and first on-off element, and reflecting electrode and capacitor lower electrode form a storage capacitors.Second substrate is parallel to first substrate, and liquid crystal layer is between first substrate and second substrate.

Aforesaid display panels, wherein said sub picture element district has an echo area and a penetrating region, and this reflecting electrode is arranged in this echo area, and this first substrate also comprises:

One flatness layer is positioned on this reflecting electrode; And

One through electrode is arranged on this flatness layer and is positioned at this penetrating region, electrically connects with this reflecting electrode.

Aforesaid display panels, wherein the protuberance of this concaveconvex structure has a height t and a width d, and the sidewall of this protuberance has a tiltangle, and wherein this width d is not less than 2*t*cot θ.

Aforesaid display panels, wherein about 1 degree of the scope of this tiltangle is to about 30 degree.

Aforesaid display panels, wherein the recess of this concaveconvex structure has a width w, and about 1 micron to about 10 microns of the scope of this width w.

Aforesaid display panels, wherein this concaveconvex structure distribution at random.

Aforesaid display panels, wherein this concaveconvex structure evenly distributes.

The present invention provides a kind of display panels on the other hand, comprises first substrate, second substrate, reaches liquid crystal layer.First substrate has a plurality of sub picture elements district, and first substrate comprises first substrate, semiconductor layer, insulation course, gate line, grid, capacitor lower electrode, dielectric layer, reflecting electrode, data line, reaches source electrode.Semiconductor layer is arranged in the substrate, and has one source pole district, a channel region and a drain region.Insulation course is arranged on the semiconductor layer, and gate line is arranged in the substrate.Grid is arranged on the insulation course and the respective channel district, and grid and gate line electric connection.Capacitor lower electrode is arranged on the insulation course.Dielectric layer is positioned on grid and the capacitor lower electrode, and directly contacts with this capacitor lower electrode, and dielectric layer has a plurality of concaveconvex structures separated from one another and is positioned on this insulation course.Reflecting electrode is arranged on the dielectric layer and with the drain region and electrically connects, and wherein reflecting electrode and capacitor lower electrode form a storage capacitors.Data line is arranged in the substrate.Source electrode is arranged on the dielectric layer and corresponding source area, and electrically connects with data line.Second substrate is parallel to first substrate, and liquid crystal layer is between first substrate and second substrate.

Aforesaid display panels, wherein the material of this semiconductor layer comprises polysilicon.

Aforesaid display panels, wherein this sub picture element district has an echo area and a penetrating region, and this reflecting electrode is arranged in this echo area, and this first substrate also comprises:

One flatness layer is positioned on this reflecting electrode; And

Therefore, the display panels that the present invention proposes when making concaveconvex structure, need not increase additional technique or light shield and just can finish, and have the reflection efficiency of lifting.

Description of drawings

Fig. 1 shows a kind of diagrammatic cross-section of micro-reflection type display panels;

Fig. 2 A shows a kind of schematic top plan view of the display panels according to the specific embodiment of the invention;

The diagrammatic cross-section of the display panels of Fig. 2 B displayed map 2A;

Fig. 3 shows a kind of diagrammatic cross-section of the concaveconvex structure according to the specific embodiment of the invention; And

Fig. 4 A and Fig. 4 B show other schematic top plan view according to the display panels of the specific embodiment of the invention.

And each description of reference numerals in the above-mentioned accompanying drawing is as follows:

100 display panels

101 echo areas

102 first substrates

103 penetrating regions

104 liquid crystal layers

105 reflecting electrodes

106 second substrates

21 grids

22 source areas

24 channel regions

26 drain regions

28 source electrodes

200 display panels

208 switch element arrays

209 first on-off elements

210 first substrates

211 first substrates

212 data lines

213 semiconductor layers

214 gate lines

215 insulation courses

216 capacitor lower electrodes

217 concaveconvex structures

218 contact holes

219 reflecting electrodes

220 flatness layers

222 through electrodes

224 sub picture element districts

225 echo areas

226 penetrating regions

230 second substrates

240 liquid crystal layers

250 backlight modules

Embodiment

Above-mentioned and other aspect, feature and advantage of the present invention will easilier under the detailed description of following various more specific exemplary embodiment and accompanying drawing be understood the identical components in the wherein identical Ref. No. ordinary representation exemplary embodiment of the present invention.Need be appreciated that also that in addition the present invention is not limited to the details of specific embodiment and describes.

Fig. 2 A shows a kind of schematic top plan view of the display panels 200 according to the specific embodiment of the invention, and Fig. 2 B shows the diagrammatic cross-section of display panels 200 along Fig. 2 A center line AA '.Display panels 200 comprises first substrate 210, second substrate 230, liquid crystal layer 240 and backlight module 250.First substrate 210 has a plurality of sub picture elements district 224, and sub picture element district 224 has an echo area 225 and a penetrating region 226.Second substrate 230 is parallel to first substrate 210, and liquid crystal layer 240 is between first substrate 210 and second substrate 230.In the present embodiment, second substrate 230 is a colored filter substrate.250 of backlight modules are positioned at first substrate, 210 belows, are used to provide backlight.

First substrate 210 comprises first substrate 211, switch element array 208, insulation course 215, dielectric layer 217, semiconductor layer 213, reflecting electrode 219, flatness layer 220, through electrode 222.First substrate 211 is provided with switch element array 208, data line 212, gate line 214, reaches capacitor lower electrode 216.Switch element array 208 comprises that first on-off element 209 is arranged in sub picture element district 224.Semiconductor layer 213 (for example being polysilicon) is positioned in first substrate 211, and has one source pole district 22, a channel region 24 and a drain region 26.Dielectric layer 217 is positioned on the switch element array 208, and has at least one contact hole 218.Dielectric layer 217 has concaveconvex structure, and reflecting electrode 219 is arranged on the dielectric layer 217 also by contact hole 218 and 209 electric connections of first on-off element.Grid 21 is arranged on the insulation course 215 and respective channel district 24.Reflecting electrode 219 electrically connects by contact hole 218 with drain region 26, and reflecting electrode 219 forms a storage capacitors with capacitor lower electrode 216.Source electrode 28 is provided with corresponding to source area 22, and electrically connects with data line 212.Flatness layer 220 is positioned on the reflecting electrode 219, and through electrode 222 is arranged on the flatness layer 220 and is positioned at penetrating region 226, electrically connects with reflecting electrode 219.Concaveconvex structure design by dielectric layer 217 makes environment light source have preferred reflection angle or reflectivity when being incident to the concaveconvex structure of dielectric layer 217, and then improves reflection efficiency.

Fig. 3 further shows the diagrammatic cross-section of the concaveconvex structure of dielectric layer 217.For example in general situation, spend the angle incidents, and pass through the design of the sidewall draft angles of protuberance 302, make the most direction that be reflected onto vertical liquid crystal display panel 200 of light energy, to improve reflection efficiency with 30.In the present embodiment, the protuberance 302 of concaveconvex structure has a height t and a width d, and the recess 304 of concaveconvex structure has a width w.The sidewall of protuberance 302 has a tiltangle, and its width d is not less than 2*t*cot θ.Preferably about 1 degree of the scope of tiltangle is to about 30 degree, and preferably about 1 micron to about 10 microns of the scope of width w.By the design of concaveconvex structure, make when environment light source is incident to reflecting electrode 219 that its reflection direction can be directed to the preferred view direction of user.

Fig. 4 A and Fig. 4 B show among other embodiment, the schematic top plan view of the concaveconvex structure 217 of display panels 200.The shape of concaveconvex structure 217 is not limited especially, is embodied as different shape and does not all hinder in enforcement of the present invention, and the embodiment shown in Fig. 4 A, the protuberance of concaveconvex structure 217 are square and even distribution.Embodiment shown in Fig. 4 B, the protuberance of concaveconvex structure 217 are circular and distribution at random.

The reflecting electrode with concaveconvex structure of the above embodiment of the present invention can be applied to various reflection LCDs or half-transparent half-reflection type LCD, when making concaveconvex structure, need not increase additional technique or light shield just can finish, for instance, when forming contact hole, can form concaveconvex structure simultaneously with connection reflecting electrode and drain region.

The above embodiments are in order to description the present invention, but the present invention is not limited to the description of above specific embodiment, and claim scope of the present invention will comprise all, and this type of is revised and variation, with real spirit according to the invention of energy and scope.

Claims

1. A liquid crystal display panel, comprising:

a first substrate, a second substrate, and a liquid crystal layer;

Wherein the first substrate has a plurality of sub-pixel regions, including:

A first substrate, on which a semiconductor layer is formed;

A switch element array is on the first substrate, wherein the switch element array includes a first switch element located in one of the sub-pixel regions, the source region and the drain region of the first switch element are formed in the semiconductor In the layer, the first switching element has an insulating layer, the insulating layer is formed on the semiconductor layer, and the gate of the first switching element is formed on the insulating layer;

a capacitor lower electrode, located on the insulating layer;

A dielectric layer, located on the insulating layer and the lower electrode of the capacitor, and in direct contact with the lower electrode of the capacitor, the dielectric layer has a plurality of concavo-convex structures separated from each other, wherein a contact hole penetrates the insulating layer and the lower electrode of the capacitor dielectric layer; and

A reflective electrode is disposed on the dielectric layer and is electrically connected to the first switching element through the contact hole, the reflective electrode and the lower electrode of the capacitor form a storage capacitor;

wherein the second substrate is parallel to the first substrate; and

Wherein the liquid crystal layer is located between the first substrate and the second substrate.

2. The liquid crystal display panel as claimed in claim 1, wherein the sub-pixel region has a reflective region and a transmissive region, the reflective electrode is located in the reflective region, and the first substrate further comprises:

a planar layer on the reflective electrode; and

A penetrating electrode is located on the planar layer and in the penetrating area, and is electrically connected with the reflective electrode.

3. The liquid crystal display panel as claimed in claim 1, wherein the convex portion of the concave-convex structure has a height t and a width d, and the sidewall of the convex portion has an inclination angle θ, and wherein the width d is not less than 2 *t*cot theta.

4. The liquid crystal display panel as claimed in claim 3, wherein the tilt angle θ ranges from about 1 degree to about 30 degrees.

5. The liquid crystal display panel as claimed in claim 3, wherein the concave portion of the concave-convex structure has a width w, and the width w ranges from about 1 μm to about 10 μm.

6. The liquid crystal display panel as claimed in claim 1, wherein the concave-convex structure is distributed randomly.

7. The liquid crystal display panel as claimed in claim 1, wherein the concave-convex structure is evenly distributed.

8. A liquid crystal display panel, comprising:

a first substrate, a second substrate, and a liquid crystal layer;

Wherein the first substrate has a plurality of sub-pixel regions, including:

a first base;

A semiconductor layer is disposed on the base, and has a source region, a channel region and a drain region;

an insulating layer is disposed on the semiconductor layer;

A gate line is arranged on the insulating layer;

A gate is arranged on the insulating layer and corresponds to the channel region, and the gate is electrically connected to the gate line;

A capacitor lower electrode is arranged on the insulating layer;

A dielectric layer is located on the insulating layer and the lower electrode of the capacitor, and is in direct contact with the lower electrode of the capacitor. The dielectric layer has a plurality of concave-convex structures separated from each other, and a contact hole penetrates the insulating layer and the dielectric layer. layer;

A reflective electrode is disposed on the dielectric layer and electrically connected to the drain region through the contact hole, wherein the reflective electrode and the lower electrode of the capacitor form a storage capacitor;

a source is disposed on the dielectric layer and corresponds to the source region; and

A data line is arranged on the source and electrically connected with the source;

wherein the second substrate is parallel to the first substrate; and

9. The liquid crystal display panel as claimed in claim 8, wherein the material of the semiconductor layer comprises polysilicon.

10. The liquid crystal display panel as claimed in claim 8, wherein the sub-pixel region has a reflective region and a transmissive region, the reflective electrode is located in the reflective region, and the first substrate further comprises:

a planar layer on the reflective electrode; and

11. The liquid crystal display panel as claimed in claim 8, wherein the convex portion of the concave-convex structure has a height t and a width d, and the sidewall of the convex portion has an inclination angle θ, and wherein the width d is not less than 2 *t*cot theta.

12. The liquid crystal display panel as claimed in claim 11, wherein the tilt angle θ ranges from about 1 degree to about 30 degrees.

13. The liquid crystal display panel as claimed in claim 8, wherein the concave portion of the concave-convex structure has a width w, and the width w ranges from about 1 micron to about 10 microns.